Automobile seat back



FIG. 1 is a front elevational view of an automobile seat back showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left-side elevational view thereof;

FIG. 4 is a right-side elevational view thereof;

FIG. 5 is a top elevational view thereof; and

FIG. 6 is a bottom elevational view thereof. 

The ornamental design for an automobile seat back, as shown. 